Apparatus for heating the ends of rods, bars, tubes, or the like



July 6, 1937. R. A. BEDFORD APPARATUS FOR HEATING THE ENDS OF RODS, BARS F TUBES, OR THE LIKE Filed Sept. 19, 1955 Jrw ,REGINALD ASLINE BEDFORD .n m Lv u w! *r m w z 0 E J% I ll llll III llllllll llllllllll lllllllllllllllllllllll Dq Patented July 6, 1937 UNE'E'E STTS reat orrlcs APFARATUS FOR HEATING THE ENDS OF RODS, BARS, TUBES, OR THE LIKE Reginald Asline Bedford, Stumperlowe, Sheffield, England 2 Claims.

This invention relates to an apparatus for heating the ends of rods, bars, tubes or the like incorporating a furnace burning oil or gas and is particularly applicable to the heating of min- 6 ing drills or bits therefor prior to forging or hardening.

The object of this invention is to provide improvements whereby the heating of the articles can be readily confined locally to the particular part which requires heating and the remaining part kept relatively cool.

The procedure of heating the ends of rods, bars, tubes or the like according to this invention consists in projecting the said ends laterally into a heating passage and subjecting them to the heat passing upwardly therethrough and simultaneously cooling the rods or the like immediately at the rear of their heated ends and exteriorly of the heating passage.

According to this invention a furnace for heat'-. ing the ends of rods, bars, tubes or the like according to the before described procedure is provided in which heat generated in a combustion chamber of said furnace is caused to be deflected upwards by a vertical wall thereof and to pass out of the combustion chamber laterally with respect to the ends of the rods or the like through a vertical heating passage, thence under and over an air preheating chamber and finally outwards through an exit flue or chimney.

Referring to the drawing filed herewith:

Fig. 1 is a front elevation of one form of furnace made in accordance with this invention;

Fig. 2 is a side elevation;

Fig. 3 is a sectional plan on the line A--B of Fig. 4;

Fig. 4 is a vertical section taken through the centre of Fig. 1.

a is the outer framing of the furnaceenclosing 40 a brickwork structure I) having a combustion chamber c into which fuel, such as for example, oil and primary air are injected at the rear of the furnace by means of a burner (1 fed by an oil pipe e and an air pipe f. The combustion cham- 45 her is provided with a vertical front wall 9 between which and the roof h a vertical heating passage 2' is formed into which the heat is defiected by the front wall g to traverse said pasrods or bars such as hollow drills p with their ends protruding into the heating passage 1' and the front of the furnace is provided with stays q to which a stirrup r is adjustably fitted for supporting the rear ends of the drills p. Supported 5 by the stays q is a manifold pipe s with branches 2 leading to the underneath of the drills in immediately in front'of the front brick n, the said pipes and manifold conveying cold air from a supply pipe 15 which also conveys air under pres- 10 sure to the preheating chamber m near the verti- K cal heating passage 2' under the control of a valve 11.. 1

The front brick 11. supporting the rods is provided with the requisite number of slots ofor the 15 maximum number of drills or the like which the furnace is capable of heating and the manifold pipe 5 is similarly provided with a corresponding, number of branch pipes t for conveying the cooling air. a wall to the heating passage 2' in conjunction with the front wall g.

Air preheated in the chamber m is conveyed therefrom by a pipe 11 for use both as primary air and secondary air, the primary air being led direct to the burner d and the secondary air being led off by a pipe w into the combustion chamber 0 through an inlet'brick a: surrounding the burner 01, said brick being adapted to convey the secondary air from the pipe win two opposite directions from the exterior to the interior of the brick so as to effect a turbulence of the secondary air as it emerges from passages y and 2 formed in the walls of the brick. A shield z is fitted to the front of the furnace.

In use, the drills or the like are positioned so that their ends to be heated protrude to the required extent into the heating passage 2', the ends thereby becoming heated and owing to the cooling air being directed upon the drills or the like 40 at the front of the front wall of the heating passage, by the pipes t, the heating is confined to the ends, thus making it possible to satisfactorily heat the ends of such rods as mining drills for sharpening and like operations where local heating of the end only is required.

What I claim and desire to secure by Letters Patent isi- 1. A furnace for heating the ends of rods, bars, tubes and the like comprising a framing carrying a brickwork structure, upper and lower walls of said structure combining to form a combustion chamber open at a side longitudinally of the furnace, said upper wall forming both the roofto the said combustion chamber and a vertical rear As will be seen this front brick n forms 20 air inlet to the combustion chamber below the roof thereof and means for conveying cold air so a as to impinge on the work immediately in front of the combined work supporting member and front wall of the treating chamber.

2. A furnace for heating the ends of rods, bars, tubes and the like comprising a framing carrying a brickwork structure, upper and lower walls of said structure combining to form a combustion chamber open at a side longitudinally of the furnace, said upper wall forming both the roof to said combustion chamber and a vertical rear wall to a relatively narrow work treating chamber situated longitudinally in parallel with and ex teriorly above the combustion chamber and in open communication therewith and with a chimney flue, an enclosed air heating chamber located interiorly of the furnace in spaced relation to the brickwork structure above the treating chamber, means for conveying heated air from said air heating chamber to the combustion chamber for combustion purposes, a renewable work supporting member carried on the lower wall and forming a front wall to the work treating chamber, said work supporting member being positioned exposedly within the furnace at an open front thereof, a fuel and air inlet to the combustion chamber below the roof thereof and means for conveying cold air so as to impinge on the work immediately in front of the combined work supporting member and front wall of the treating chamber.

REGINALD ASLINE BEDFORD. 

